There are certain predictable stages that all historical research questions go through:
--William Cronon, Learning Historical Research
Visit William Cronon's website for comprehensive guidelines on doing historical research: http://www.williamcronon.net/researching/index.htm
Primary sources refer to documents or other items that provide first-hand, eyewitness accounts of events.
FINDING TIPS
Add the word 'Sources' to your subject search term for finding primary sources in Environmental History:
Human ecology History Sources
Environmental protection History Sources
Add a Country, state or region name for specific primary sources, ex.:
Environmental protection History United States Sources