sources
- https://www.pmulcahy.com/bolt-action_sporting_rifles/german_ba_spr_a.htm
- https://gundigest.com/rifles/anschutz-rifle-a-primer-on-the-german-precision-rimfires
- http://www.nramuseum.org/guns/the-galleries/innovation,-oddities-and-competition/case-25-camp-perry/anschutz-model-1813-bolt-action-rifle.aspx