15 books • 3 series
Murder In Hells Canyon
Murder at John Day Fossil Beds
Murder at Mt St. Helens (Curmudgeons, #12)
Murder at Spirit Lake (Curmudgeon, #12)
Murder in the Narrows (Curmudgeon's Inc, #7)
Murder on the Blue Ridge (Curmudgeon, #6)
Truckin' for Murder
The Science of Wastewater
Science of Renewable Energy
The Handbook of Nature
Forest-Based Biomass Energy
The Science of Air
Handbook of Water and Wastewater Treatment Plant Operations
Safe Work Practices for Wastewater Treatment Plants
Water and Wastewater Treatment