Cite
APA Citation
Collins, H. P., Dick, J. A., Bennett, J. G., Pern, P. O., Rickards, M. A., Thomas, D. J., Washington, J. S., & Jacobsen, M. (1988). irregularly shaped small shadows on chest radiographs, dust exposure, and lung function in coalworkers' pneumoconiosis.. Occupational and environmental medicine, 45(1), 43–55. http://access.bl.uk/ark:/81055/vdc_100143576760.0x000040