[Haskell-cafe] LC online references

Hi, I hope I am not too OT here. I am in the process to coming to terms with various calculi based on the lambda calculus. I end up returning to LC books all the time to put things in context. However, I have taken to living out of my laptop and certainly can't carry around the laptop, the book I am reading plus Barendregt's book (plus my phone, plus ....). Besides, I can't afford to buy any books and the library is going to want it back sometime. Does anyone have any pointers to useful online references for the LC? Matt