- KEITH SPENCER COLLECTION (CA County Maps & Books) - https://keithwspencer.net/Library/Library.shtml
- MOUNT DIABLO INITIAL POINT (By John Pettley - Zoom Presentation) - https://us02web.zoom.us/rec/play/rFFvZZFDCEHn9t17Qb2FYZgLiEs-J6_MZ_7FvYr...
- CURTA CALCULATORS:
History - https://en.wikipedia.org/wiki/Curta
Info - www.vcalc.net/cu.htm
Your Curta Calculator - http://www.curtamania.com/curta/code/type_and_age_of_your_curta.php
The Curta - www.youtube.com/watch?v=fhUfRIeRSZE
Show & Tell - www.youtube.com/watch?v=P0cGjC62XRQ&t=127s
Pawn Stars - www.vcalc.net/Media/Pawn-Stars-Curta/Pawn-Stars-Curta.html
The 3D-Printed Curta - www.youtube.com/watch?v=j9uRckJLqLk
- PUBLIC LAND SURVEY SYSTEM (PLSS) -https://en.wikipedia.org/wiki/Public_Land_Survey_System#:~:text=Also%20k....
- HISTORICAL EMPORIUM (Period Clothing) - https://historicalemporium.com
- TIME and NAVIGATION - https://timeandnavigation.si.edu
- MUSEUM of MEASUREMENT and TIME - www.museumofmeasurementandtime.org/services.html
- PLUMB BOBS (Coming Soon)