Stikkord: Norges Handels-Kalender

https://www.nb.no/items/de05100cbc7271355f3d1b5e2620d935?searchText=%22idar%20sandersen%22~1

PS.

Idar sin mor (min oldemor Ingeborg Olsdatter) var forresten halvt svensk:

https://www.myheritage.no/relationship-diagram-OYYV7BZW3ICEXLNCX7W4WZVX7QUZIYQ/ribsskog#1000003-1000163

PS 2.

Idar brukte forresten sin farfar (min tippoldefar Ole Martin Sandersen) sitt etternavn (av en eller annen grunn):

https://www.myheritage.no/relationship-diagram-OYYV7BZW3ICEXLNCX7W4WZVX7QUZIYQ/ribsskog#1000163-1000096