The Reference and User Services Association (RUSA) has announced the annual list of Best Historical materials and 1914-1918-online has made that list!

"The list, in its 11th year, recognizes the evaluation and effectiveness in coverage of historical resources in all fields of history. Published in Reference and User Services Quarterly (RUSQ), these sources are selected by a committee that seeks to improve the usefulness of bibliographies and indexes in the field of history and shared among bibliographers, indexers, publishers and professional associations." (ALA press release of Sun, 02/01/2015)

http://www.ala.org/news/press-releases/2015/02/annual-list-best-historical-materials-selected-rusa-s-history-section