Attachment Size JCOM_1701_2018_A02.pdf 306.9 KB Printer-friendly versionLog in to post comments Book traversal links for Appealing to different motivations in a message to recruit citizen scientists: results of a field experiment ‹ Focusing attention to improve the performance of citizen science systems: Beautiful images and perceptive observers Up Building an apparatus: Refractive, reflective and diffractive readings of trace data ›