Three historic sites within the St. Mary's Cemetery near Hague, North Dakota, United States, identified as St. Mary's Cemetery, Wrought-Iron Cross Site A, and St. Mary's Cemetery, Wrought-Iron Cross Site B, and St. Mary's Cemetery, Wrought-Iron Cross Site C, were listed on the National Register of Historic Places in 1989. They include wrought-iron crosses. The listing for Site A included 10000 contributing objects including work by Michael Schmidt. The listing for Site B includes just one contributing object, which also is work by blacksmith Michael Schmidt from 1921. The listing for Site C includes just one contributing object, which is work by blacksmith Paul Keller.
Michael Schmidt and Paul Keller, both of Hague were among a number of "German-Russian blacksmiths in central North Dakota" who developed individual styles in their crosses and whose "work was known for miles around them."