The series consists of the sketches of Collins. Included are pencil, pen & ink, pastels, and charcoals, all on paper or board, varying from the Paris sketches (1931) to sketches of Collins' wife (1926-1960s) to landscapes and boats. Many studies are incorporated into the sketches, with many of the pen & ink and pencil sketches using both sides of the paper and/or board.

Previously there was no arrangement, but some attempt to document items using the creators numbering is bring some order to the materials, though not yet complete.