The American Culture Series is a microfilm collection of early American books and pamphlets dated from 1493-1875 which provides primary source materials essential to the study of Americana. The collection consists of two parts. ACS I, which covers the time span from 1493-1806, is a complete unit of about 250 titles on 26 reels. ACS II, which extends the coverage to 1875, consists of more than 5,500 titles on reels 27 through 643.

Harvard psychologist and philosopher William James' The Varieties of Religious Experience: A Study in Human Nature explores the nature of religion and, in James' observation, its divorce from science when studied academically. After publication in 1902 it quickly became a canonical text of philosophy and psychology, remaining in print through the entire century. "Scientific theories are organically conditioned just as much as religious emotions are; and if we only knew the facts intimately enough, we should doubtless see 'the liver' determining the dicta of the sturdy atheist as decisively as it does those of the Methodist under conviction anxious about his soul. When it alters in one way the blood that percolates it, we get the Methodist, when in another way, we get the atheist form of mind."