From the National Archives, RG 109, Ch. 6, Vol. 707-709; “Letters Received and Sent, Chimborazo Hospital. 1861-64.” 3 Vols.: Vol. 707. p. 24

Conf. States of America
Med. Purv. Office
Richmond Jan 1/62

Sir
        You are requested to inform this Department, how many cots have had the canvass substituted by wooden frames, & whether there are more frames at your Hospitals than will be needed for the cots on hand.

Very Respectfully
   Yr Obt Servt
       E. W. Johns
           Q. M. D.

Surgn J. B. McCaw
in charge Chimborazo Hospl
Richmond Va