Hello Doni Stern
Please consider writing your question in English to:
1. Urząd Stanu Cywilnego in Szczecin (Registered office in Szczecin)
E-mail:
usc@um.szczecin.pl
In Poland, birth/marriage and death records not older than 100 years are kept in registry offices.
According to Polish law, photo of the document is not a legal document, therefore it is easier to get, but remember that in Europe we have General Data Protection Regulation (GDPR) and you may be asked to prove your right to get other person's personal data. Guess, explanation that person was your mother's sister is good enough.
If the above address fails, then please try this:
2. Archiwum Państwowe w Szczecinie (State Archives)
e-mail:
sekretariat@szczecin.ap.gov.pl
One hour of searching through electronic or dusty books costs about 15 USD, but the guys are professional and fast. If they find something you will be asked to pay. 1 USD per scan after you have received everything by e-mail.
3. Besides, if you know your great-grandparents names (again GDPR mentioned) there is a good chance you may find more in Polish Geneteka with indexed records, below 2 links with examples:
For Mendel surname and Polish region >łódzkie< with all places
Geneteka wyszukiwarka nazwisk Polskiego Towarzystwa Genealogicznego w metrykach i aktach stanu cywilnego. Zawiera ponad 47.000.000 indeksów z ponad 4500 parafii.
geneteka.genealodzy.pl
and
Waksman family name and region lubelskie
For the surname Waksman and the Polish region >lubelskie< with all localities
Geneteka wyszukiwarka nazwisk Polskiego Towarzystwa Genealogicznego w metrykach i aktach stanu cywilnego. Zawiera ponad 47.000.000 indeksów z ponad 4500 parafii.
geneteka.genealodzy.pl
Map of Polish regions and names are in the link:
https://geneteka.genealodzy.pl/
It is easy to find out how Geneteka works, just click here and there.
By the way in Lublin there is a Waksman hotel. Google will help to find it
Good luck, Romuald Miller