1) If you buy lumber from a lumber yard, you will know what you are getting. Price depends strongly on type! Where the wood is a composite, such as plywood or particle board, there may be less information.
2) Paper is much trickier, and there’s no strong tradition in the paper industry to reveal details of paper composition. In fact, some information might be regarded as a trade secret. The eHow article (below) mentions Birch, Oak, Pine and Spruce as being commonly used.
The second URL from the Ecology Global Network gives a good overview of the history of paper, and includes suggestions about replacing wood with other plants.
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