Assembly Concurrent Resolution 180, 1998, designated those portions of US 40 that are still publically maintained and not already designated as part of Historic US 40 as "Historic US 40". The route remained unchanged until the 1963 renumbering.
Senate Concurrent Resolution 66, Chaptered May 18, 2006 (Resolution Chapter 51), designated, upon application by an appropriate local governmental agency, any section of former Alternate U. Highway Route 40 that is still a publicly maintained highway and that is of interest to the applicant, as Historic Alternate U. It ran from US 101 near Mountain View to present-day I-680 near Milpitas.
"Route" usually indicates a state shield signed route, but said route may be signed as US or I.
Previous Federal Aid (pre-1992) categories: Federal Aid Interstate (FAI); Federal Aid Primary (FAP); Federal Aid Urban (FAU); and Federal Aid Secondary (FAS).
Current Functional Classifications (used for aid purposes): Principal Arterial (PA); Minor Arterial (MA); Collector (Col); Rural Minor Collector/Local Road (RMC/LR).
Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.
There are over forty such techniques, each using a different radioactive element or a different way of measuring them.
He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.