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In page Henrietta C. Bartlett:

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Bartlett and Pollard's Census was the first attempt to locate and catalogue systematically all extant copies of Shakespeare quartos before 1709. The project relied on the existing expertise of Bartlett and Pollard, but it also incorporated bibliographic data from many libraries, universities, booksellers, and private collectors; Bartlett later noted that she had sent out over 400 letters requesting information in the lead-up to publication in 1916.[2] Bartlett continued to revise and expand the existing data, and (without Pollard) she compiled a new and more complete edition of the Census in 1939. The Census provides a wealth of information on the provenance, condition, binding, and size of each copy.[citation needed]