Sub-subseries contains the protocols of study completed that where used by Dr. Thomas Cherian and Manuel Scarowsky during their work for the Duke project. Divided in 8 sections following the division made by the researchers. The documents are in alphabetical order. Includes protocols forms.

The Rebus Valentines sub-subseries consists of printed valentines that contain puzzles or cryptographic messages that the recipient must decipher. This can include messages written in hieroglyphics or hidden in endless knots.

Sub-subseries pertains to the project itself. Contains 28 files. Manuel Scarowsky, Michel Rotenberg and Thomas Cherian files. Includes correspondence, notes, protocols of study, documentation, forms, reprints, statement, cv, lists, graphs, reports, notebook, articles,

The Scrapbooks sub-subseries contains a full scrapbook of publisher’s samples, as well as individual scrapbook pages with multiple attached cards that have been extracted from a book. The cards in these scrapbook pages usually include a bulk price per dozen and instructions from the publishers, such as to specify the desired message inside the card. There are some pages that may be from a personal scrapbook as the cards pasted inside it are signed by a sender.

The Sentimental Valentines sub-subseries consists of cards, handmade or manufactured, in which a long, sentimental poem is the main feature. The cards range in terms of format and style. They may be elaborately decorated by hand with several materials, or simple printed on cardstock. They are usually illustrated with allegorical images or stock illustrations of couples, mythology or landscapes. Some of the cards have handwritten messages professing one’s love for the recipient. They are excellent examples of Victorian sentimentality and 19th century poetic verse.

This sub-subseries includes working notes for unpublished or unrecorded speeches and includes talks, addresses, and corrected drafts.

The Stationer's Scraps sub-subseries is comprised of 15 scraps of card. These consist of individual pieces of cutout card that have either fallen off existing cards, or which were meant to be used by a cardmaker in the fabrication of greeting cards. They are excellent examples of the small details that were included in the decoration of cards during manufacturing.

Sub-subseries contains Sharma’s study notes from Harvard University, 1967-1978.