anti-air warfare formations and dispositions
band iron formations BIFs
banded iron formations BIFs
Benxi-Taiyuan formations
bit-pinching formations
boundary between Neogene and Palaeogene Formations
Changxing Feixianguan formations
Coal-bearing formations
Continental volcanic-sedimentary formations
core recovery from pebble-bearing and gravel-bearing rock formations
deep formations in Songliao basin
deep formations of Daqing Oilfield