Book by the Snead & Co. Iron Works – Library planning, bookstacks and shelving (Full text at Google books – click on book cover at Google to see full text)
Here is a 1908 version of the book at Internet Archive: Book stack and shelving for libraries
Wikipedia entry for Angus Snead Macdonald
Excerpt: Angus Snead Macdonald was an American architect and businessman; from 1915 to 1952 the president of Snead and Company. This company manufactured the cast iron book stacks found in libraries all over the world in the beginning of the 20th century including the Washington DC Public Library and Harvard’s Widener Library. After World War I Angus Snead Macdonald would lead Snead and Company to revolutionize and standardize library book stacks.
Snead Standard Stack at Columbia
Columbia University Library, New York City. Snead Standard Stack in one of the third floor seminar rooms
http://www.loc.gov/pictures/resource/ppmsca.15561/ (picture)