All three series. This edition is based on on the first published collection, edited by Mabel Loomis Todd and T.W. Higginson, which was released in three "series", the first of which appeared in 1890. According to Wikipedia, Mabel Loomis Todd "became friends with the Dickinsons, and though she never met Emily Dickinson in person, the two women exchanged letters. After Emily's death in 1886, hundreds of her unpublished poems were discovered. In 1888, Emily's sister Lavinia asked Todd to copy and organize the poems, which were to be sent to the publisher Thomas Wentworth Higginson. The first volume of Poems by Emily Dickinson was published in 1890. This version included many alterations by Todd. In 1896, Todd and the Dickinson family had a falling-out over a legal battle regarding property owned by Austin Dickinson. As a result, Emily Dickinson's manuscripts were split between the two families. In 1945, Todd's daughter Millicent published some of the poems from Todd's portion of the manuscripts."
