Bendo - Moniker and Apache pretty well sum it up...
I was going to suggest that you just get a receipt off the seller of the Jeppesen manuals. ATO unlikely to accept a receipt for the beer under the 'Written Evidence' provisions (Sub-Division 900E of the ITAA 1997 if you can't sleep).
If you're 'in business' (ie, not an employee) it's a different story as the ATO accepts bartering at a fair market value as the basis for deductions and assessable income - GST will also be applicable in most cases.
You'll need to buy me one of those beers if you want more advice on this issue...
Cheers
T