A natural occurrence of graphite cones, John A. Jaszczak, George W. Robinson
John Jaszczak

Manganotantalite from the Alto do Giz area, Equador, Rio Grande do Norte, Brazil, George W. Robinson, John A. Jaszczak, Reinhard R. Wegner, Owen P. Mills
John Jaszczak

Minerals of the Lake Superior Iron Ranges, George W. Robinson, Gene L. LaBerge
A. E. Seaman Mineral Museum Publications

Mineralogy of Michigan, George W. Robinson
A. E. Seaman Mineral Museum Publications

Manganotantalite from the Alto do Giz area, Equador, Rio Grande do Norte, Brazil, George W. Robinson, John A. Jaszczak, Reinhard R. Wegner, Owen P. Mills
Department of Physics Publications

A natural occurrence of graphite cones, John A. Jaszczak, George W. Robinson
Department of Physics Publications