Lica, I don't know how you would find out much information since you are in the United States. Do your adoptive parents know anything? Did you ask them? Try these two agencies:
National Adoptive-Guardian Center of the Children Friends Society (Warszawa, ul. Jasna 26, tel. 011-48-22 827-7651 or 826-0874)
Catholic Adoptive-Guardian Center (Warszawa, ul. Grochowska 194/196, tel. 011-48-22 610-5149, fax 610-6123)
Good luck. I hope you find them real soon.
Anna Sparky's Mom