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made links to the codebook zip files "downloadable" by opening the HREF links via TARGET='_new'

NESCent/dplace,stefelisabeth/dplace,NESCent/dplace,D-PLACE/dplace,shh-dlce/dplace,D-PLACE/dplace,D-PLACE/dplace,stefelisabeth/dplace,stefelisabeth/dplace,stefelisabeth/dplace,shh-dlce/dplace,NESCent/dplace,shh-dlce/dplace,NESCent/dplace,shh-dlce/dplace,D-PLACE/dplace