Verifiability of what  His letters are available and his work is widely distributed in fact Science mentions as much and they have been referred to extensively  Keep in mind that this is not a debate on Oreskes work but on Oreskes life  Peisers work on her essay has had a profound impact  somebody looking to understand Oreskes work and contributions would not have the benefit of a complete picture if we were to just ignore Peiser  I agree  its not an issue of fact its an issue of relevance