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Multilingual
21
Gruber, Gary R, 747.076-G885t | Monarch Press | 1977 747.076-G885t,
22
Gruber, Gernot, 670.99-G885m | Jossey-Bass Publishers | 1994 670.99-G885m,
23
Gruber, Jeffrey S., 701.5-G885l | North-Holland Publishinh Company | 1981 701.5-G885l,
24
Gruber, Edward C, 410.76-G885g | Simon and Schuster | 1981 410.76-G885g,