21.
 |  | Title: Ground Water Tracers by S.N. Davis, D.J. Campbell, H.W. Bentley, T.J. Flynn ISBN: 999686717X Publisher: National Groundwater Association Pub. Date: June, 1985 List Price: $18.75 Amazon.com Price: $18.75 |
22.
 |  | Title: Monitoring Ecological Condition in the Western United States: Proceedings of the Fourth Symposium on the Environmental Monitoring and Assessment Program (Emap), San Francisco, Ca. April 6-8, 1999 by Symposium on the Environmental Monitoring and Assessment Program 1999, Brian D.. Melzian, Edward R. Long, Walter G. Whitford, Barbara T. Walton, Kathy A. Riikonen, J. A. Ghiloni, J. F. Campbell, p McGivney, Shabeg Sandhu ISBN: 0792364937 Publisher: Kluwer Academic Publishers Pub. Date: October, 2000 List Price: $162.00 Amazon.com Price: $162.00 |
23.
 |  | Title: Cool Mutts by H. D. R. Campbell, Katrina Fried, J. C. Suares ISBN: 1556706812 Publisher: Stewart, Tabori & Chang Pub. Date: August, 1997 List Price: $15.95 Amazon.com Price: $15.95 |
24.
 |  | Title: Dictionary of Aviation by R.D. Campbell, R. J. Hall ISBN: 1558621067 Publisher: St James Pr Pub. Date: April, 1991 List Price: $50.00 Amazon.com Price: $50.00 |
25.
 |  | Title: Field Transport of Cryptosporidium Surrogate in a Grazed Catchment by Appiah Amirtharajah, Michael H. Young, Kurt D. Pennell, Jean L. Steiner, Dwight S. Fisher, Dinku M. Endale, J. Phil, Sr. Campbell, Leora Tanenbaum ISBN: 158321206X Publisher: Amer Water Works Assn Pub. Date: July, 2002 List Price: $205.00 Amazon.com Price: $205.00 |
26.
 |  | Title: Microlight Flying Manual by R. D. Campbell, J. Jones ISBN: 1853101893 Publisher: Airlife Publishing Ltd Pub. Date: November, 1990
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27.
 |  | Title: Synoptic Gospels a Commentary for Teache by D B J Campbell ISBN: 0719501873 Publisher: Trafalgar Square
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28.
 |  | Title: The Past Speaks to the Future: 50 Years of the Protestant Hour by Douglass M. Bailey, Eugene Carson Blake, James D. Brown, Edmond L. Browning, Joan Salmon Campbell, Herbert W. Chilstrom, John Claypool, Harry A. Fifield, Laurence Gibson, J. Wallace Hamilton ISBN: 0687002427 Publisher: Abingdon Press Pub. Date: August, 1995 List Price: $9.95 Amazon.com Price: $9.95 |
29.
 |  | Title: Umap Modules: Tools for Teaching, 1984 by Paul J. Campbell, Philip D. Straffin ISBN: 0912843071 Publisher: C O M A P, Incorporated Pub. Date: October, 1985 List Price: $35.00 Amazon.com Price: $35.00 |
30.
 |  | Title: Clinical Medicine and Health in Developing Africa by G. D. Campbell, J. K. Seedat, G. Daynes ISBN: 0908396627 Publisher: Prometheus Books Pub. Date: June, 1983 List Price: $28.50 Amazon.com Price: $28.50 |