Abstract: An enlarged print book is produced by microfilming the front and back pages or sides of each sheet of an original book, preparing an enlarged print of each page from the microfilm, severing each page approximately in half on a separation line compatible with the printed matter thereon for subsequent binding at the separation, preparing printing plates of the bottom of one page and the top of the succeeding page in the book with the separation lines registered for subsequent binding, printing on one side of a quantity of sheets the bottom of said one page and on the other side of the quantity of sheets the top of the succeeding page, collating the sheets, and binding them together with the separation lines at the binding and the printed matter registered to form a book which, when opened, exposes the enlarged top half of each page of the original book above the enlarged bottom half of the same page of said original book.

Abstract: An enlarged print book is produced by microfilming the front and back pages of each sheet of an original book, printing each of such pages from the microfilm at a desired page size, severing each printed page approximately in half, arranging the bottom half of one page above the top half of a succeeding page with the severed upper end or trim line of the bottom half a predetermined distance above the severed lower end or trim line of the top of the succeeding page, microfilming such arrangement on a single film frame, enlarging the single frame to a predetermined extent to produce a single enlarged sheet having the bottom half at its top and top half at its bottom, trimming the top and bottom halves at exactly their respective upper and lower trim lines, folding each enlarged sheet precisely midway between their trim lines with the printed sides of the bottom and top halves exposed, producing each succeeding enlarged sheet from the original book in the above manner, and binding successive enlarged sheets toge