Series IX, Scrapbooks, contains Pratt's scrapbooks which have been taken apart for permanent storage. They include memorabilia from Pratt's college years, his travels abroad and the growth of his family. Contents have been arranged in the following subseries: Family Achievements, Miscellaneous, Photographs, Postcards, Travel Miscellany, and Williams College-Related Material. Edith Cornell Pratt Howard's scrapbook (1921) is also part of this series.
I. Biographical Material, 1898-1947
II. Class and Lecture Notes
III. Lectures and Assorted Topics
VI. Questionnaires for Research
X. Travel Diaries