The water-striders of Ontario : (Heteroptera: Gerridae) Cheng, Lanna. creator Fernando, C. H. contributor Royal Ontario Museum. contributor text book Toronto Royal Ontario Museum 1970 1970
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ENG Gerridae QL523 G4 C4 Life sciences miscellaneous publications https://www.biodiversitylibrary.org/bibliography/60777 427709 10.5962/bhl.title.60777 OTU