As an interdisciplinary area locating books for research in conflict resolution varies by focus. Here is a short list of call number ranges:
GN 301-674: Ethnology. Social and cultural anthropology.
HM 711-1281: Social systems
HQ 281: Human trafficking. Transnational crime.
HV 6430-6433.8: Terrorism
JV: Colonization, immigration and international migration
JZ: International relations
KF: Dispute resolution, mediation (US)
KZ: International law
U: Military