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Genealogical Sources are Primary Sources about the individual you are researching. These sources can include but are not limited to:
Birth / Marriage / Death Certificates
Military / Government Records
Ancestry Library: Ancestry.com's online search tool, providing access to a collection of documents -- including census data, birth, marriage, and death records, almanacs, and newspapers -- meant to facilitate genealogical research. This is a library version of Ancestry.com, which means you cannot create an account, construct family trees, contact other people, or use DNA information. That said, it is free access to the vast collection of materials Ancestry has amassed; an excellent starting point!
MyHeritage: Gain access to over 9 billion primary source records, including census data, tombstone images, military records, yearbooks, and citizenship records. Includes documents from outside of the United States of America. Again, no personal accounts, family trees, etc. may be used through this library version of MyHeritage.
Fold3: Fold3 provides access to US military records, including the stories, photos, and personal documents of the men and women who served.
Family Search: A free online search tool with billions of genealogical records. You can create family trees on Family Search without charge, though you still must register an account.