TY  - RPRT
TI  - Underwater observations of breakwaters at North Point Marina, Winthrop Harbor, Illinois
AU  - R.C. Circe
AU  - D. Blackwood
PY  - 1991
DO  - 10.3133/ofr91327
UR  - https://pubs.usgs.gov/publication/ofr91327
ID  - ofr91327
ER  -