Basic information on a large number of trees with a classification of their threat. From Friends of the Earth.
Pine (Redwood) Spruce (Whitewood), Teak, Ash, Balsa, Beech, Birch, Western red cedar, Douglas fir, Iroko, Larch, Mahony (Meranti/lauran), Oak, Ramin, Sepele, Utile

Very detailed pictures, illustrations and text showing various parts of the tree trunk.

Pictures of 80 trees with botanical information including 10 Pines.

"All you need to know about timber" from the Timber Research and Development Association. Timber species database covering over 100 popular timbers with very detailed information. Library = Covers an extensive range of timber related information.

Good information on Plywood (interior & exterior WPB, shuttering, marine), Chipboard (veneered, melamine faced), Stirling board, hardboard, blockboard, stripboard.

Database of 56 popular timbers with information on their workability, finish, usage and other properties. Many with pictures showing colour and grain pattern. i.e. Ash (2), Balsa, Birch, Western red cedar, Douglas fir, Elm, mahogany (3), Oak (3), Pines (3), Redwood, Teak.

30 popular UK timbers with description of species, working and physical properties, durability and main uses, density. Pictures showing colour and grain pattern.

Standard dimensions for sawn softwoods. Length, width and thickness.

Different wood finishes - dyes, stains, oils, varnish, polish.

List of British trees with details.

57 pictures of trees and cross sections of tree trunks. List of the oldest trees.

Details of the largest tree in the world.

Text and pictures showing fire damage.