00485nam a2200157ua 4500003001000000005001700010008004100027040003000068110004600098245002400144260006300168500004500231500002400276650001700300655001000317AR-SsjUCA20250715141521.0250228s1973 xxk 000 0 eng d aAR-SsjUCAbspacAR-SsjUCA2 aNational Coal Board (Gran Bretaña) NCB 10aSurveying practice. aLondon :bNational Coal Board :bMining Department,c1973. aCab. Port. NCB (Mining) codes and rules. aIncluye 28 figuras. 4aTopografía 4aTexto