https://www.trinitypsalterhymnal.org/authors/landstad-magnus-b/
Landstad, Magnus B. - Trinity Psalter Hymnal
magnusbtrinitypsalterhymnal
https://www.forgottenweapons.com/landstad-patent-and-another-mystery-gun/
Landstad Patent and Another Mystery Gun
Jun 19, 2013 - Two mystery rifles, unmarked in the Belgian Army museum in Brussels, and a copy of the Norwegian patent for the Landstad 1900 automatic revolver.
and anotherpatentmysterygun