Here are some books on English etymology and the English Language. they are purely for research purposes and very helpful for learning about our language and its history.
They may seem to have no bearing on this forums topics, but Laws are written in the English language, people argue in English, people here write in English so I believe they have supreme significance even if it is just for educational purposes.
the books are, in no particular order:
A dictionary of English etymology
http://rapidshare.com/files/245509828/__A_dictionary_of_English_etymology_.pdf
Philosophic etymology or Rational grammar
http://rapidshare.com/files/245510757/__Philosophic_etymology__or_Rational_grammar_.pdf
A Complete Etymology of the English Language
http://rapidshare.com/files/245511530/_A_Complete_Etymology_of_the_English_Language_.pdf
A dictionary of English etymology (different from above)
http://rapidshare.com/files/245516316/_A_dictionary_of_English_etymology_.pdf
A dictionary of the English language
http://rapidshare.com/files/245518405/_A_dictionary_of_the_English_language_.pdf
Desk standard dictionary of the English language
http://rapidshare.com/files/245545225/_Desk_standard_dictionary_of_the_English_language_.pdf
English etymology 1898
http://rapidshare.com/files/245546178/_English_etymology__1898__.pdf
English etymology (different from above)
http://rapidshare.com/files/245546773/_English_etymology_.pdf
Etymology and Syntax of the English Language
http://rapidshare.com/files/245547853/_Etymology_and_Syntax_of_the_English_Language_.pdf
Lectures on the science of language
http://rapidshare.com/files/245548637/_Lectures_on_the_science_of_language_.pdf
Max Müller and the philosophy of language
http://rapidshare.com/files/245549136/_Max_Mueller_and_the_philosophy_of_language_.pdf
An analytical dictionary of the English language
http://rapidshare.com/files/245551475/An_analytical_dictionary_of_the_English_language__.pdf
Notes on English etymology
http://rapidshare.com/files/245553987/_Notes_on_English_etymology_.pdf
Outlines of etymology
http://rapidshare.com/files/245554407/_Outlines_of_etymology_.pdf.
Principles of English etymology (2 Vols)
http://rapidshare.com/files/245558995/_Principles_of_English_etymology_.pdf.html
http://rapidshare.com/files/245556890/_Principles_of_English_etymology_vol_2_.pdf
Significant etymology or Roots stems and branches of the English language
http://rapidshare.com/files/245562005/_Significant_etymology___or__Roots__stems__and_branches_of_the_English_language_.pdf
Spelling turned etymology
http://rapidshare.com/files/245563207/_Spelling_turned_etymology_.pdf
The Class-book of Etymology
http://rapidshare.com/files/245564559/_The_Class-book_of_Etymology_.pdf
The model etymology
http://rapidshare.com/files/245566107/_The_model_etymology_.pdf
The science of etymology
http://rapidshare.com/files/245567543/_The_science_of_etymology_.pdf
The science of language, linguistics, philology & etymology
http://rapidshare.com/files/245568290/_The_science_of_language__linguistics__philology__etymology_.pdf
Words and their ways in English speech
http://rapidshare.com/files/245572009/_Words_and_their_ways_in_English_speech_.pdf
An Analytic Dictionary of English Etymology
http://rapidshare.com/files/245572942/An_Analytic_Dictionary_of_English_Etymology.pdf
Dictionary of Slang and Unconventional English
http://rapidshare.com/files/245574644/Dalzell_Concise_New_Partridge_Dictionary_of_Slang_and_Unconventional_English.pdf.html
Dictionary of etymology derived from latin
http://rapidshare.com/files/245576297/Dictionary_of_etymology_derived_from_latin_.pdf
Dictionary of Symbols
http://rapidshare.com/files/245577243/Dictionary_of_Symbols.pdf.html
Oxford Dictionary
http://rapidshare.com/files/245578561/Oxford_Dictionary.pdf.html
A Plain English Guide to Legal Terms
http://rapidshare.com/files/245578702/Patrick_O_Connor_-_A_Plain_English_Guide_to_Legal_Terms.pdf
Metaphors Dictionary
http://rapidshare.com/files/245581498/Metaphors_Dictionary.pdf.html
The Cambridge Encyclopedia of the English Language
http://rapidshare.com/files/245586031/The_Cambridge_Encyclopedia_of_the_English_Language.pdf.html
Teaching and learning vocabulary
http://rapidshare.com/files/245590439/Teaching_and_learning_vocabulary.pdf
With respect
Macswin