* European Treaties bearing on the History of the United States: This book, published in 1917, was a culmination of her extensive research on diplomatic relations and treaties between European powers and the United States. It's considered a landmark work in American diplomatic history.
* The Colonial Period of American History: This was a comprehensive textbook on the period from 1492 to 1783, used in universities and high schools. It went through several editions and was highly regarded for its thoroughness and objectivity.
* The Life and Work of John Paul Jones: This 1913 biography shed new light on the life of the famed naval hero, focusing on his contributions beyond the Revolutionary War.
* The English Colonies in America: This was a multi-volume project aimed at providing a detailed and nuanced understanding of the individual colonies in the early American period. However, she only completed two volumes before her death, focusing on Virginia and New York.
Beyond these major works, she also authored various articles and essays on American history, particularly on colonial diplomacy and the early development of the United States. She was a dedicated scholar who played a key role in shaping the understanding of early American history.