P D Powers

FISHWAYS -- AN ASSESSMENT OF THEIR DEVELOPMENT AND DESIGN -- FINAL REPORT

J F Orsborn, P D Powers, 1985 .

ANALYSIS OF BARRIERS TO UPSTREAM FISH MIGRATION -- FINAL REPORT

J F Orsborn, P D Powers, 1986 .

Analysis of Barriers to Upstream Fish Migration: Final Project Report Part 4 of 4

P D Powers, 1985 .

Design of road culverts for fish passage

P D Powers, K Bates, B Bernard, 2003 .