-
1LlyfrCyhoeddwyd 1963“...Federal Council for Science and Technology (U.S.). Committee on Oceanography...”
-
2Trafodyn Cynhadledd LlyfrCyhoeddwyd 1969“...Federal Council for Science and Technology (U.S.)...”
-
3Trafodyn Cynhadledd LlyfrCyhoeddwyd 1973“...Federal Council for Science and Technology (U.S.). Committee on Scientific and Technical...”