For contribution of data: Pierre Détienne, CIRAD, Montpellier, France, woods of Madagascar.

For contribution of images:
Pieter Baas, National Herbarium of The Netherlands, Leiden University

Hans Beeckman, Royal Museum of Central Africa, Tervuren, Belgium

Narareet Boonchai, University of Florida, Gainesville, Florida, USA

Sherwin Carlquist, Santa Barbara Botanic Garden, California, USA

Jean-Claude Cerre, International Wood Collectors Society

Peter Gasson, Royal Botanic Gardens, U.K. (primarily Fabaceae)

Jugo Ilic, CSIRO, Australia

Rene Klaassen, work done for PhD at Leiden University, The Netherlands (primarily Sapindaceae)

Jifke Koek-Noorman, Utrecht University, The Netherlands

Frederic Lens, K.U. Leuven, Belgium (Ericales)

Steve Manchester, University of Florida, Gainesville, USA

A.M.W. Mennega, Utrecht University, The Netherlands

Regis Miller, USDA Forest Service, Forest Products Laboratory, Madison, WI, USA. (primarily "Flacourtiaceae")

Shuichi Noshiro, Forestry and Forest Products Research Institute, Ibaraki, Japan (Japanese woods and Cornaceae)

Imogen Poole, Utrecht University, The Netherlands (many temperate S. Hemisphere species)

Marcelo Pace, Smithsonian, UNAM

Roberto Pujana, Museo Argentino de Ciencias Naturales. Buenos Aires, Argentina.

V.M.N. Razakandraibe, A.N.A. Aritsara, T. Ramananantoandro, H. Razafimandimb, ESSA, Madagascar

Hans Georg Richter, Institut für Holzbiologie, Universität Hamburg, Germany (commercially important woods and Lauraceae)

Paul van Rijckevorsel, Utrecht, The Netherlands (Opiliaceae)

L.Y.T. Westra, Utrecht University, The Netherlands

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