Errors corrected on periodical page for "Once a Week"

Ed had noticed a discrepancy in our wording about the publication dates of Whitman's poems published in Once a Week in the late 1890s. We had incorrectly stated that all three poems published in that periodical were published within months of Whitman's death in March 1892. Only one poem, "A Thought of Columbus," was published in 1892. The two other poems, "On, On the Same Ye Jocund Twain" and "Unseen Buds," had appeared in June of 1891. We have corrected the wording to reflect this, more clearly laying out the chronology of Whitman's poems published in Once a Week. The page can be seen here.

- Kevin