A book made up of pages is described. At least some of the pages contain both space for manually-created visual content, and instances of preprinted indexing target symbols. Each of the indexing target symbol instances has at least a portion within one inch of three unbound page edges. When the book is closed, the instances of each particular indexing target symbol are in a substantially collinear stack that is substantially perpendicular to the faces of the pages.

A set of sheet dividers comprises a first plurality of sheet dividers, each divider comprising a sheet with a tab extending therefrom at a different location along the same side as all other dividers in the first plurality and to a first extent from the opposite side of the sheet, and a second plurality of sheet dividers, each divider comprising a sheet with a tab extending therefrom at a different location along the same side as all other dividers in the second plurality and to a second extent from the opposite side of the sheet that is greater than the first extent.

A reusable notebook is used with heat-erasable ink. The reusable notebook includes a binding configured to hold a plurality of pages, at least one cover, and at least one ready indicator. The ready indicator is configured to indicate that at least one page in the notebook has reached at least a critical temperature. The critical temperature is a predetermined minimum temperature that is sufficient to erase thermochromic ink on the page(s). The indication occurs when the ready indicator is at a temperature equal to or above a predetermined minimum temperature referred to as the ready temperature. When the ready indicator is at or above the ready temperature, the critical temperature of the at least one page is reached.

A set of sheet dividers comprises a first plurality of sheet dividers, each divider comprising a sheet with a tab extending therefrom at a different location along the same side as all other dividers in the first plurality and to a first extent from the opposite side of the sheet, and a second plurality of sheet dividers, each divider comprising a sheet with a tab extending therefrom at a different location along the same side as all other dividers in the second plurality and to a second extent from the opposite side of the sheet that is greater than the first extent.

A book made up of pages is described. At least some of the pages contain both space for manually-created visual content, and instances of preprinted indexing target symbols. Each of the indexing target symbol instances has at least a portion within one inch of three unbound page edges. When the book is closed, the instances of each particular indexing target symbol are in a substantially collinear stack that is substantially perpendicular to the faces of the pages.

A set of sheet dividers comprises a first plurality of sheet dividers, each divider comprising a sheet with a tab extending therefrom at a different location along the same side as all other dividers in the first plurality and to a first extent from the opposite side of the sheet, and a second plurality of sheet dividers, each divider comprising a sheet with a tab extending therefrom at a different location along the same side as all other dividers in the second plurality and to a second extent from the opposite side of the sheet that is greater than the first extent.

A set of sheet dividers comprises a first plurality of sheet dividers, each divider comprising a sheet with a tab extending therefrom at a different location along the same side as all other dividers in the first plurality and to a first extent from the opposite side of the sheet, and a second plurality of sheet dividers, each divider comprising a sheet with a tab extending therefrom at a different location along the same side as all other dividers in the second plurality and to a second extent from the opposite side of the sheet that is greater than the first extent.

A set of sheet dividers comprises a first plurality of sheet dividers, each divider comprising a sheet with a tab extending therefrom at a different location along the same side as all other dividers in the first plurality and to a first extent from the opposite side of the sheet, and a second plurality of sheet dividers, each divider comprising a sheet with a tab extending therefrom at a different location along the same side as all other dividers in the second plurality and to a second extent from the opposite side of the sheet that is greater than the first extent.

Systems and apparatus for covering, protecting, and concealing personal, private, confidential, and nonpublic information and/or covering and concealing printed and/or hand-written text, lettering, graphics, drawings, and/or marks on one or more sheets, pages, or pages, of a book. The systems and apparatus can include a releasable, removable, or un-releasable binding device, tamper-evident features, labeling features, and binding components can be configured to fasten, connect, and/or secure covering devices and which can substantially rotate 360 degrees, fold back upon itself, lie flat when open and/or closed, and releasably cover personal, private, nonpublic, or other information, and/or cover and/or conceal printed and/or hand-written text, lettering, graphics, drawings, and/or marks on one or more sheets, pages, or pages, of a book.

Systems and apparatus for covering, protecting, and concealing personal, private, confidential, and nonpublic information. The systems and apparatus can include a releasable, removable, or unreleasable binding device, tamper-evident features, labeling features, and binding devices can be configured to connect and secure covering devices and which can substantially rotate 360 degrees, fold back upon itself, lie flat when open, and releasable covering devices to cover personal, private, nonpublic, or other information.