Do you have a reference you think is useful? If so please contact me to see about inclusion so we can help all collectors.

Books–https://vintageamericanbicycles.com/index.php/books/

Serial Number Lists–https://vintageamericanbicycles.com/index.php/serial-numbers/

Hub Dating–https://vintageamericanbicycles.com/index.php/hub-dating/

Tire Dating–https://vintageamericanbicycles.com/index.php/tire-dating/

Twin Flex Adjustment-coming Soon

Wheel Truing-https://vintageamericanbicycles.com/index.php/wheel-truing/

Columbia Fork Lock-https://vintageamericanbicycles.com/index.php/columbia-fork-lock/

Columbia Kickstand Assembly-coming soon