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Samples in periodicals archive:
1) Nonetheless, Kennedy and Cooper  showed that the natural density of the Niven numbers is zero.
While most improvements can often be handled after taking the photograph, he explores how utilization of polarizers and natural density filters can save processing time and result in an improved image file.
ABSTRACT Growth of "stunted" greenlip abalone in areas with low maximum sizes was enhanced over 6 mo by reducing their natural density and by translocation to habitats supporting faster growing abalone.