Would somone know where icould fall to find out about marriage records in Beaver Co. Pa. in the time period of 1925-1950?

Also, need to know if a library or the Historical society maintains an obituary index. Not sure yet of the death year. If you could provide a phone number, I would really appreciate it. Please contact me at.
patriciagrimm2001@yahoo.com
Thank you in advance for your help and time.

Pat Grimm in AZ.