Description: There are several ways to date postcards that are seemingly undated. This page provides a few general methods for determining a time period or date for postcards.GENERAL POSTCARD CHRONOLOGY[edan-image:id=siris_sic_13846,size=250,left]Postcard producers printed cards that followed the current trends of postcards. Dates can be approximated by the material and design of a
Description: The Smithsonian Environmental Research Center is located near Maryland’s Chesapeake Bay, on land donated by Robert Forest in 1965. Initially a field station, the center focused on environmental research, including the work of the Radiation Biology Laboratory. Today, the Center studies links between coastal zone land and water ecosystems. History of the Smithsonian
Description: Joseph Henry,the first Smithsonian Secretary, served from 1846 to 1878 and was a physicist who conducted pioneering research in electromagnetism.