Pacific Northwest 1990 Insect Control Handbook by University Extension Services

Flora of the Pacific Northwest : An Illustrated Manual, Hardcover by Hitchcoc...

Pacific Northwest 1988 Weed Control Handbook by OSU, UofI & WSU

Pacific Northwest 1988 Plant Disease Control Handbook by OSU, UofI & WSU

Pacific Northwest 1997 Plant Disease Control Handbook by OSU, UofI & WSU

Pacific Northwest 1995 Insect Control Handbook by OSU, UofI & WSU

Pacific Northwest 1986 Weed Control Handbook by OSU, UofI & WSU

Pacific Northwest 1998 Weed Control Handbook by OSU, UofI & WSU