New Orleans street map : features full street index, schools, shopping malls ; included Gretna, Harahan, Kenner … orientation map. (OCLC #881472331)
Due to recent staffing changes and re-organization, our map cataloger is now part of my cataloging and metadata group. I am beyond delighted! She’s great, and map cataloging problems are wily ones.
This map appears to have two copyright statements from different corporate bodies, and different dates. The cover lists Rand McNally ©2013, and the statement below the legend has the publisher GM Johnson & Associates ©2014.
RDA 18.104.22.168 on Copyright Dates says that when multiple copyright dates apply to a single aspect (and I don’t have any evidence that they are for specific aspects) to record only the latest copyright date. Stonybrook’s guide even mentions this case specifically for maps. We also included both firms as publishers in a single 264 field:
264 _1 ǂa [Burnaby, B.C.] : ǂb GM Johnson & Associates ; ǂa Chicago, IL : ǂb Rand McNally, ǂc 
Library of Congress’s training materials say it would be incorrect to use separate 264s for this.