Try the AMA website at this address: http://www.modelaircraft.org/499_15.asp If that site won't come up do a search at the AMA page using the "Advanced Search" button for "Covering Foam Wings With Brown Paper."

There are quite a few articles out there on this covering method, especially in the British model literature. This one is a good summary on using white glue and brown paper to cover foam wings. Can also substitute thinned epoxy for the white glue but the weight goes up and really isn't any stronger.