Pearl Coast Zoo - historical memorabilia

This is the letter I received from Pearl Coast Zoo in 1990. Unfortunately in 1990 we do have here in Poland very early stage of capitalism and I could not send any money abroad (the younger of you may be surprised - but there were days without PayPal and Western Union). All in all he agreed to send me some complimentary printed materials from his Pearl Coast Zoo and I in return sent him a couple of guides from Polish zoos.