dredging
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Looking Seaward From Ohio, Or "Sunshine" Key. Much of the Small Island Has Been Dredged and Filled for Commercial Development. As a Result, Water Clarity Has Diminished.
by U.S. National Archives
by U.S. National Archives
No known copyright restrictions(著作権制限なし)

Snorkeler at John Pennekamp Coral Reef State Park near Key Largo. At the Time of This Picture, Water Clarity Was Good, But Experienced Divers Say Clarity Is Far Less Than It Was 20 Years Ago Because of Dredging and Filling Operations by Land Developers.
by U.S. National Archives
by U.S. National Archives
No known copyright restrictions(著作権制限なし)

Campsite at Ohio, Or "Sunshine" Key. Extensive Dredging Filling and Defoliation Have Taken Place to Make Way for a "Travel-Trailer" Camp.
by U.S. National Archives
by U.S. National Archives
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
![[Dredge Filling Two Barges with Oysters, Houston Pipe Line Company]](http://farm3.static.flickr.com/2812/11825206244_df1fab7047_m.jpg)
[Dredge Filling Two Barges with Oysters, Houston Pipe Line Company]
by SMU Libraries Digital Collections
by SMU Libraries Digital Collections
No known copyright restrictions(著作権制限なし)
901件~960件 (全 9,779件)