Identifying Reptilian Parasites by Dr. Klingenberg DVM 2nd edition is a pretty good guide that'll suite your needs. You shouldn't have a hard time finding it as it's a very common book.
Keep looking for a vet for hots and croc's. Worms arn't a big problem compared to what can happen and it's nice to have that security. If you need some hints on finding herp vets, just ask

Good luck!

Ian