Вопрос о русской этимологии / A question on Russian etymology

[kasak.livejournal.com]

Is there some online resourse (either in English or на русском) where I can find out the origins of Russian words? Many good English dictionaries will include a brief description of how the word entered into the language, and I was wondering if there was some way I could get a Russian dictionary that does the same thing. If people could recomment something in print that I could purchase, I'd appreciate the input.

Спасибо!