TY - JOUR T1 - California digging JF - Breathe JO - breathe SP - 267 LP - 271 DO - 10.1183/18106838.0603.267 VL - 6 IS - 3 AU - L. Hendriks Y1 - 2010/03/01 UR - http://breathe.ersjournals.com/content/6/3/267.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -