Subject
United States Foreign relations
29
History
21
Dredging spoil
16
Dredging spoil Environmental aspects
16
Defense contracts
13
Dredging Environmental aspects
13
Channels (Hydraulic engineering)
11
Dispute resolution (Law)
11
Dredging
11
Cryptography History
10
Ice on rivers, lakes, etc
10
Locks (Hydraulic engineering)
10
Procurement
10
Diversion structures (Hydraulic engineering)
9
Flood control
9
World War, 1939-1945 Cryptography
9
Hydraulic structures
8
United States Armed Forces Procurement
8
Environmental policy
7
Facilities
7
Harbors
7
Military research
7
Negotiation
7
Nereis
7
Soil pollution
7
Spillways
7
Stream channelization
7
World War, 1939-1945 Campaigns
7
Management
6
Sediment transport
6
Water resources development
6
World War, 1939-1945
6
Arab-Israeli conflict
5
Conflict management
5
Flood damage
5
Marine sediments
5
Officials and employees
5
Personnel management
5
Pumping stations
5
Recruiting, enlistment, etc
5
Scour (Hydraulic engineering)
5
Trials, litigation, etc
5
Wetlands
5
Appropriations and expenditures
4
Frazil ice
4
Frozen ground
4
Groundwater Pollution
4
Harbors Environmental aspects
4
Ice mechanics
4
Intakes (Hydraulic engineering)
4
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