Attend a book signing for “Cascadia Field Guide: Art, Ecology, Poetry” from 7 to 8 p.m. July 27. The new book blends art and science to celebrate this diverse yet interconnected region through natural and cultural histories, poetry, and illustrations. Organized into thirteen bioregions, the guide includes entries for everything from cryptobiotic soil and the western thatching ant to the giant Pacific octopus and Sitka spruce, as well as the likes of common raven, hoary marmot, Idaho giant salamander and snowberry. Poems range from comic to serious, colloquial to scientific, urban to off-the-grid, narrative to postmodern. Art ranges from classic natural history drawing and form line design to graffiti and sketches. Cascadia Field Guide co-editor Derek Sheffield will be joined by contributors Barbara Drake, David Oates, Joe Wilkins, Kim Stafford, Nancy Slavin, Paulann Petersen and Travis London at Powell’s City of Books, 1005 W. Burnside St., Portland.