AHR Registration question

[JUDYK89@aol.com]

Okay, so I finally received my registration papers on my new mare (was making 
payments, seems like forever) and most all of her ancestry is listed as: 
PASB, RASB, SAHR.  I know it has something to do with Russian, Polish 
heritage, but can anyone tell me exactly what it means?  It isn't real 
important because I bought the horse, not her pedigree, but I'm curious.  
She's out of Wijenna, out of PASB Tallin. 

Thanks

Judy