1314.PATENT D.H. 1978 THE WORLD OF WORMS. 124PP. ILLUSTRATED. HARD COVER WITH A DUST JACKET. VERY GOOD CONDITION. (GNH-BSE-82).
1323.PATENT D.H. & SCHROEDER P.C. 1978 BEETLES AND HOW THEY LIVE. 159PP. ILLUSTRATED. HARD COVER WITH A DUST JACKET. VERY GOOD CONDITION. (GNH-BASE-83).
3516.PATENT D.H. 1977 DE TAAL DER INSEKTEN. 134PP. ILLUSTRATED. SOFT COVER VERY GOOD CONDITION. (GNH-BASE-92).
1019697 1988 FIRST EDITION 88PP. ILLUSTRATED HARD COVER WITHA DUST JACKET VERY GOOD CONDITION TU 62.
1016439 1979 160PP. ILLUSTRATED HARD COVER WITH A DUST JACKET NEAR FINE CONDITION. STE 573.
2068.PATENT D.H. 1982 SPIDER MAGIC. 40PP. ILLUSTRATED. HARD COVER WITH A DUST JACKET. (BROWN DUST JACKET) VERY GOOD CONDITION. (GNH-BASE-134).