G.B. Sidder A.E. Garcia J. C. Wynn P. G. Schruben Elis Lugo D. P. Cox Felix Martinez Haydee Rincon J.C. Stewart Yasin Estanga Iris Marcano Miguel Martinez Ines Rendon Ivan Rivero Nelson Rivero Urbano Ubencio W. E. Brooks 1996 application/pdf 10.3133/i2537 en Geologic map of the Rio Caura 2 degrees x 3 degrees Quadrangle, Estado Bolivar and Estado Amazonas, Venezuela reports