Volumes.” A special cross-time reference index is contained in each volume to facilitate locating the same question across different years. One can thus derive trend data on approximately 1,500–2,000 variables for the entire sample or for important subgro (2011)

by Y M Emery, S Szczypka, G, L D Johnston
Venue:in appendix D.) It is available on the MTF website (www.monitoringthefuture.org) under “Publications” and then “Occasional Papers.”123 WEBSITE Any