31/12/1969
Part of the illustrative material is folded.
Some nos. are issued in revised editions.
Microfiche.
Mode of access: Internet.
Issued by the U.S. Bureau of Mines.
bib
http://hdl.handle.net/2027/uc1.b3022070
http://hdl.handle.net/2027/uc1.b3022071
http://hdl.handle.net/2027/uc1.b3022072
http://hdl.handle.net/2027/uc1.b3022073
http://hdl.handle.net/2027/uc1.b3022074
http://hdl.handle.net/2027/uc1.b3022075
http://hdl.handle.net/2027/uc1.b3022076
http://hdl.handle.net/2027/uc1.b3022077
http://hdl.handle.net/2027/uc1.b3022078
http://hdl.handle.net/2027/uc1.b3022079
http://hdl.handle.net/2027/uc1.b3022080
http://hdl.handle.net/2027/uc1.b3022082
http://hdl.handle.net/2027/uc1.b3022083
http://hdl.handle.net/2027/uc1.b3022084
http://hdl.handle.net/2027/uc1.b3022086
http://hdl.handle.net/2027/uc1.b3022087
http://hdl.handle.net/2027/uc1.b3022088
http://hdl.handle.net/2027/uc1.b3022089
http://hdl.handle.net/2027/uc1.b3022091
http://hdl.handle.net/2027/uc1.b3022092
http://hdl.handle.net/2027/uc1.b3022093
http://hdl.handle.net/2027/uc1.b3022094
http://hdl.handle.net/2027/uc1.b3022095
http://hdl.handle.net/2027/uc1.b3022096
http://hdl.handle.net/2027/uc1.b3022097
http://hdl.handle.net/2027/uc1.b3022098
http://hdl.handle.net/2027/uc1.b3022099
http://hdl.handle.net/2027/uc1.b3022100
http://hdl.handle.net/2027/uc1.b3022101
http://hdl.handle.net/2027/uc1.b3022102
http://hdl.handle.net/2027/uc1.b3022103
http://hdl.handle.net/2027/uc1.b3022104
http://hdl.handle.net/2027/uc1.b3022105
http://hdl.handle.net/2027/uc1.b3022106
http://hdl.handle.net/2027/uc1.b3022107
http://hdl.handle.net/2027/uc1.b3022108
http://hdl.handle.net/2027/uc1.b3022109
http://hdl.handle.net/2027/uc1.$b185658
eng
Washington, U.S. Govt. Print. Off.,
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