The Henry Langford Loucks Collections contains four series: Correspondence, Printed Materials, Typescripts and Ephemera.
The Correspondence series contains four outgoing letters to concerning the South Dakota Farmers' Alliance and a letter from John T. Belk secretary of the Farmers Co-Operative Association to the membership of the association.
The Printed Materials includes a large selection of Newspaper Clippings concerning farming and state utilities and several political pamphlets written by Loucks.
The Typescript series contains copies of political writings by Loucks.
The Ephemera series contain handwritten notes, most likely written by Loucks, and a hand drawn political cartoon.