Echo sounder and side-scan sonar equipment diagrams.

Call Number: 
3310 y-2 Folded - F
Map Description: 
2 sheet : Vellum paper with ink and transfers ; 28 x 23 cm.
Originals for slides used in a talk at 17th Conference on Great Lakes Research, 1974; Variations of originals for figure 1 and figure 2, Environmental Geology Notes 74
Sonar investigations - Lake Michigan
Added Entries: 
Environmental Geology Notes 74


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