„X This study was conducted to see to what degree parents¡ perceptions about the effects of sibling status on children are reflected in their perceptions of their own children. This was tested by selecting a sample of voluntary parents who attended a psychology course at an urban college in...

Prior to the 1920's, very few people were aware of the term or concept "biosphere", and prior to the 1960's minimal people knew the term "environment". Beginning around the 1930's, literature concerning this topic began to appear. Up until this time Americans thou...