1991 WNPS awarded an EPA grant to begin work on A Field Guide to the Common Wetland Plants of Western Washington and Northwestern Oregon by Sarah Spear Cooke, Editor (co-published with Seattle Audubon Society 1997)
1992 WNPS funds Rainshadow: Archibald Menzies and the Botanical Exploration of the Olympic Peninsula by Jerry Gorsline.
1992 WNPS publishes “Celebrating Wildflowers” brochure with the US Forest Service, Mt. Baker-Snoqualmie National Forest.
1993 “Wildflowers Across Washington” color poster by artist Louise Smith is printed.
1995 WNPS co-publishes the Celebrating Wildflowers K-12 Curriculum Workbook with the Mt. Baker Snoqualmie National Forest and the North Cascades Institute.
1995 WNPS co-publishes the Watchable Wildflowers book and brochure series with the Oregon-Washington division of the Bureau of Land Management.
1997 WNPS and Seattle Audubon co-publish editor Sarah Spear Cooke’s A Field Guide to the Common Wetland Plants of Western Washington and Northwestern Oregon.
2000 WNPS publishes Conservation of Washington’s Rare Plants and Ecosystems, the proceedings from a conference of the Rare Plant Care and Conservation Program, University of Washington, April 17-18, 2000. editors: Sarah H. Reichard, Peter W. Dunwiddie, John C. Gamon, Art R. Kruckeberg, and Debra L. Salstrom.