Family registers and family books

The Dietrichson family is well documented in printed family registers and family books. The oldest date from the late 1800s, and the last major book came out in 1974.
In 1882 David Dietrichson published «Stamtavle over slægten Dietrichson med de kognatiske descendenter» in Christiania. It has 33 pages and is freely available from the National Library of Norway. He gives himself as a lieutenant, and it is probably Lieutenant David Dietrichson (1856–1921). The cover in the picture has the same spelling, «Slægten», and may be from this edition, but this is not confirmed.
The register came out in a new, expanded edition in 1923 from the Cammermeyer bookshop, published by David Dietrichson and Cathrine Dietrichson. It has 142 pages. Wikipedia says that Lieutenant David Dietrichson died in 1921, two years before this edition. That may mean that it is a different David, or that the year is wrong. Cathrine Dietrichson (born 1850) was one of the publishers. She was also one of the authors of a family register for the Bøckman family in 1929. A supplement to the register is listed under her name with the year 1949, even though she died in 1938. Why is unclear.
The book «Slekten Dietrichson 1724–1924» has the years from the arrival in 1724 to 1924 on its cover. We have not found it in the catalogue of the National Library, and we do not know who wrote it.
The last major book is «Slekten Dietrichson 1724–1974», published by the family committee in 1974 and edited by Jan W. Krohn-Holm. It has 141 pages and is listed in the catalogue of the National Library, but can only be read from a Norwegian IP address. It can be ordered via the page «Books and family trees». The books themselves are in Norwegian.