There are fingering charts in the back of the Yehudi Menuhin Oboe Music
Guide by Leon Goossens and Edwin Roxburgh, published by Macdonald in London.
Before ordering, you might like to take a peep at the British Double Reed
Society's web site at
http://www.bdrs.demon.co.uk/
I don't know if this will help, but it might interest you anyway!
Regards,
Richard Partridge.