By Bardell, P.R..
Bilbao : Urmo, 1970

By Seferian, D..
Bilbao : Urmo, 1981 843140065X

By Langefors, Ulf.
Bilbao : Urmo, 1976 8431400250

By Francis, Wilfred.
Bilbao : Urmo, 1969

By Barnard, J.A..
Bilbao : Urmo, 1970 .
259 p. : 24 cm.

By Randerath, Kurt.
Bilbao : Urmo, 1970 .
291 p.

By Barnard, A.K..
Bilbao : Urmo, 1968 .
377 p. : 24 cm.

By Heinrich, E.W..
Bilbao : Urmo, 1970 .
456 p.

By Fleming, Ian.
Bilbao : Urmo, 1974 .
223 p.

By Williams, Dudley H..
Bilbao : Urmo, 1971 .
148 p.

By Tedder, J.M..
Bilbao : URMO, 1974 .
432 p. : 23 cm.
8431402245

By Tedder, J.M..
Bilbao : URMO, 1974 .
413 p. : 23 cm.
8431402407

By Brennan, D..
Bilbao : Urmo, 1970 .
296 p. :

By Chaussin, C..
Bilbao : URMO, 1972 .
314 p. : 24 cm.

By Bu'lock, John D..
Bilbao : Urmo, 1969