It seems that some of the PDF books were damaged by a compression program before uploading. These have all been identified and will be fixed shortly.
A quick update on the site – there are plenty more documents to be uploaded. The files already uploaded are being sorted and transcribed. In time there will be methods for visitors to volunteer to help with the categorising and transcription.
Further in the future translation efforts will also begin on the documents in languages other than English.
A “full text search” system is being developed to make researching as easy as possible, and a system of tagging will ensure you always find exactly what you need and no knowledge remains hidden.