My Stamp Collection - Czechoslovakia, Usa, Cuba, Germany Etc

Hello!
Would you like to see my stamp collection?
Mainly: Czechoslovakia, also USA, Germany, Bulgaria, Cuba, USSR and other countries.
5 pages total, the "next" button is on the bottom of the page:

http://s769.photobucket.com/user/an...tal%20stamps

I am not an expert, so I would appreciate (if you have time) if you could look at it and if you see any error stamps or valuable staps to tell me, or if I have something valuable. I just want to know how much is my collection worth.
Thank you!

Very Nice collection! To the community! Enjoy Your Stay!

Very Nice Welcome as well!

Thank you for the compliments, guys... I have found a couple of valuable peaces in my collection, but I need an expert to tell me around what amount is the value of my collection. Thanks. :)

No answers? O_O

Enlarge & scan pictures of the specific stamps you are referring too!

I am sure that there will be some interest in identifying your "Hradcany" stamps if you post a few scans here. It would appear to me that you have several of the Mucha designed types. I think there were five types plus a few sub-groups altogether... both imperforate and perforated. Although not expensive items there might be a rarity amongst your collection of Hradcany stamps.