Surface Air Sampling Program--80th Meridian Network January-December 1972.
D000398:Air Pollution, Radioactive / Q000032:analysis*; D002564:Cerium Isotopes; D002587:Cesium Isotopes; D009656:North America; D011005:Plutonium / Q000032:analysis; D011834:Radiation Monitoring; D011868:Radioisotopes; D013020:South America; D013326:Strontium Radioisotopes; D015040:Zirconium / Q000032:analysis
D002564:Cerium Isotopes; D002587:Cesium Isotopes; D011868:Radioisotopes; D013326:Strontium Radioisotopes; D011005:Plutonium; D015040:Zirconium