PE Notes was originally a private online wiki to help with engineers taking the PE. Some of it's data has been translated to wikiengineer under the creative commons license with the requirement that the information provided be attributed to PE Notes. Although the original license did not allow modifications to the information to occur, sraymond (the admin of PE Notes) allowed for a waiver so that we could build upon what he has spent so much time putting together.
We here at wikiengineer thank PE Notes and it's previous authors for the valuable contributions they made to our website.
The information from PE Notes that was transfered was tracked here.