How to find addresses in old Gdansk/Danzig

The Pomorska Biblioteka Cyfrowa (Pomeranian Digital Library) has digitized (DjVu format) German-language address directories (like phone books but mostly without phone numbers) for Gdansk and environs up to 1942. This is fantastic.

How to find and use these books:

1. Install some DjVu software if you haven’t already. These books are in DjVu format. See http://djvu.org/resources/
2. Go to http://pbc.gda.pl/dlibra/
3. Click the British flag to select an English interface. Some interface things are still not translated, but clicking the flag will help. 
4. Search for Książki adresowe to list all of them or search for Książki adresowe yyyy where “yyyy” is a specific year for which you’re hoping to find a directory. “Szukaj” is the “Search” button.
   
   Shortcut: you can search for a person's name in this search box and find all address books with a match, but this depends on reliable OCR; OCR usually is not 100 percent reliable, so I would still go and look up your names manually as described below.
5. In the search results, hover your mouse pointer over a title to see the full title. These books are in German, but you just need to read the date. 
6. Click a title to display a book summary. 
7. On the book summary page, copy and paste all of the book summary to your own records. If you’re going to use the book as a source, you need that information. 
8. Click the book image to open the book in your DjVu software. 
9. Use the page number selector to change the displayed page. 
10. I'm not sure about earlier editions yet, but at least from 1928 to 1942, volume one (“I. Tiel” at the top of the page) is sorted by last name and volume two (“II. Tiel” at the top of the page) is sorted by street name and address.
    Browse volume one by last name to find people you’re interested in. Each entry lists the person's profession and address. If you don't know German, you'll need a cheat sheet to read the professions.
    Browse volume two by street name and address number if you’re doing a building history, or if you want to see who else lived near the person you’re interested in. 
11. When you find something, do a screen print to get an image of the page that you can include in your documents. You can also click T to display the results in plain text for reading and copying, but be careful to compare the text to the image; OCR makes mistakes.
12. Be sure to note both the electronic page number displayed in the DjVu viewer and the print page number as it appears on the page image. In combination with the book summary information, this will give you full source information.