©
rwgabbro1: Chicago in Stone and Clay: A Guide to the Windy City's Architectural Geology (NIU Imprint of Cornell University Press)
©
rwgabbro1: Geology Underfoot in Illinois (Mountain Press, 1997)
©
rwgabbro1: The Plant Explorer's Guide to New England (Mountain Press, 1994)
©
rwgabbro1: The Amateur Geologist (Franklin Watts, 1993)
©
rwgabbro1: Picture Guide to Tree Leaves (Franklin Watts, 1991)
©
rwgabbro1: Milwaukee in Stone and Clay: A Guide to the Cream City's Architectural Geology (NIU Imprint of Cornell University Press)
©
rwgabbro1: A Geology Guidebook Author's Dream Come True . . .
©
rwgabbro1: Celebrating the Cream City's Urban Geology: Milwaukee in Stone and Clay (2024)
©
rwgabbro1: For Your Delectation: A Photo Show and a Radio Interview