Assertion: headless horseman | /r/HasProperty | published in monthly serialized form
Facets:
value: during 1866
type: TEMPORAL
value: during 1865
type: TEMPORAL
Source sentences:
text: The Headless Horseman is also a novel by Mayne Reid, first published in monthly serialized form during 1865 and 1866, and subsequently published as a book in 1866, based on the author's adventures in the United States.