Hi Sheila,
It is customary among art collections to list the artist's birth and death year 
after their name (if known- or just birth year if still living), to list the year of 
the painting (if known), a ca. year if confident and the exact year is unknown 
and to list nothing for the year (a blank- not n.d.) if the date is totally 
unknown.  Hope this helps.
Sincerely,
Dave Ryan
Registrar
Colorado Springs Pioneers Museum
www.cspm.org

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