I need an address in Magdeburg Germany before 1938 #germany

Andreas Schwab

The 1932 Magdeburg directory is online here: https://wiki.genealogy.net/Magdeburg/Adressbuch_1932
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For a list of online historical directories in Germany see https://wiki.genealogy.net/Kategorie:Online-Adressbuch
Andreas Schwab, Montreal, Canada

Chaya Lerner

Im looking for my grandparents’ address in Magdeburg Germany before 1938. How can I find this info? 
Thank you
Chaya Lerner