It is easy:

1.	Make cave collection with at least 5 caves
2.	Make records ot that collection (copy them from your player directory)
3.	Pack cave collection with records and send it to my e-mail address marek.mojzik@atlas.cz
4.	You can add to your letter if you want to I give your records on Hufeek's homepage and other suggestions.

All collections are (and will be) FREEWARE.