John Francis Downey

John Francis Downey · Government Printing Office, New Zealand

141 sayfa · 1928

gold mining / quartz reef mining

John Francis Downey · G.H. Loney, government printer

305 sayfa · 1935

Gold mines and mining

John Francis Downey · Cadsonbury Publications

143 sayfa · 2003

Gold mines and mining / History

John Francis Downey · C. Griffin

258 sayfa · 1928

Mine timbering / Mining engineering