Correction made to date in letter from Mary Van Nostrand to Walt Whitman

The correspondence index listed the date for a letter from Mary Van Nostrand to Walt Whitman as March 16, 1878, while the letter itself listed March 16, 1875.  Though a date is not listed on the letter in the author's hand, the letter is dated March 16, 1878, in volume 7 of the Correspondence (Iowa City, IA: University of Iowa Press, 2004, p. 145).  I have adjusted the date accordingly. 

~ Nikki