If your FamilySearch center needs posters, please work with the high councilor over family history to decide what you need and how to obtain them. The Church does not provide posters to centers. If you choose to produce materials locally, do not use the FamilySearch or Church logos on them.
You can also order customized items from BYU Print Services.
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Ordering customized materials for a FamilySearch center
Online resources for FamilySearch centers
New Church-provided equipment for a FamilySearch center