Q. Where can I find George Macdonald's translations of Martin Luther's hymns?

Good sources for digitized books online where 19th century and older, public domain books may be found are:

HathiTrust Digital Library www.hathitrust.org
The Internet Archive www.archive.org
Europeana www.europeana.eu/
Digital Public Library of America http://dp.la/
Google Books http://books.google.com