Marine sand and gravel mining [report]

1978 unpublished
About the cover: The 30,000-ton "hydro-barge" Ezra Sensibar, an ocean-going suction hopper dredge designed for sand and gravel mining . It is self-loading and self-unloading, carries a crew of 11, and can dig in water depths up to 100 feet (Construction Aggregates Corp., Chicago) .
doi:10.3133/25293 fatcat:bnjetlth55eulnehoiwtt5uxrm