21.
 |  | Title: L'absorption minérale chez les végétaux, (Monographies de physiologie végétale) by R Heller ISBN: 2225387206 Publisher: Masson Pub. Date: 1974
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22.
 |  | Title: Manuel de statistique biologique (Gauthier-Villars université, 515. Statistique appliquée) by R Heller ISBN: 2040033424 Publisher: Gauthier-Villars Pub. Date: 1974
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23.
 |  | Title: Gérer le changement by R. Heller ISBN: 2842701348 Publisher: Mango Pub. Date: 04 June, 1999
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24.
 |  | Title: Computer Representation and Manipulation of Chemical Information by NATO Advanced Study Institute, S.R. Heller, R.J. Feldmann, E. Hyde, W.T. Wipke, W. Todd Wipke, North Atlantic Treaty Organization Scientific Affairs Division, Chemical Notation Association ISBN: 0898741424 Publisher: Krieger Pub Co Pub. Date: 01 August, 1981 List Price: $24.50 Amazon.com Price: $24.50 |
25.
 |  | Title: Physiologie végétale by R. (René) Heller, R. (Robert) Esnault, C. (Claude) Lanec ISBN: 2100039911 Publisher: Dunod Pub. Date: 14 October, 1998
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26.
 |  | Title: Prendre des décisions by R. Heller ISBN: 284270133X Publisher: Mango Pub. Date: 04 June, 1999
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27.
 |  | Title: New Trends in Biology Teaching/Tendances Nouvelles De L'Enseignement De LA Biologie, Vol 5 (Teaching of Basic Sciences) by R Heller ISBN: 9231024477 Publisher: Bernan Associates Pub. Date: 01 December, 1987 List Price: $20.00 Amazon.com Price: $20.00 |
28.
 |  | Title: Abrégé de physiologie végétale by R Heller ISBN: 2225466629 Publisher: Masson Pub. Date: 1977
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29.
 |  | Title: Savoir déléguer by R. Heller ISBN: 2842701291 Publisher: Mango Pub. Date: 14 April, 1999
|
30.
 |  | Title: The Annual of the American Institute of Graphics Arts (Annual of the American Institute of Graphic Arts) by David R. Brown, Moira Cullen, Steven Heller, Ellen Lupton, Rick Poynor ISBN: 0823063917 Publisher: Watson-Guptill Publications Pub. Date: 01 October, 1995 List Price: $59.95 Amazon.com Price: $59.95 |