[en] Based on an innovative approach to wood resources, this study aimed at improving the assessment of the wood biomass availability (in forests, outside of forests, with respect to potential usages), at characterising this availability with respect to exploitation technical conditions, to mobilisation economic conditions, and to a sustainable management of resources, and according to a yearly crop. It also aimed at determining the resource mobilisation feasibility from technical and economic points of view, and at determining environmental benefits and limitations. Thus after an overview of the study context, objectives and scope of validity, the report addresses biomass availabilities of the main wood resources and of supplementary wood resources. Possible ways for future improvements are finally briefly discussed