WRCA currently has over 120,000 monographic book titles and over 3,000 serial titles listed on the Melvyl catalog. The serials collection consists of journals, annual reports, and specialized newsletters, including many unique titles published by water and irrigation districts, federal, state, and local governments, and non-profit organizations.

Other printed materials are included in the Archival and Oral Histories collections. See How to Find WRCA Materials for additional information on using the collection.