Section 306.23 - Securities eligible to be held in the Legacy Treasury Direct®Book-entry Securities System(a)Eligible issues. The Secretary has published in the FEDERAL REGISTER notices describing Treasury issues of bonds and notes issued before August 1, 1986, that are eligible for conversion to the Legacy Treasury Direct book-entry securities system.(b)Conversion of Registered Security to book-entry form to be held in Legacy Treasury Direct. To convert a registered security to book-entry form to be held in Legacy Treasury Direct, the owner must contact the Bureau of the Fiscal Service, P.O. Box 426, Parkersburg, West Virginia 26106-0426, for instructions. A security that has been converted to book-entry form in Legacy Treasury Direct shall be subject to subpart C and other applicable portions of 31 CFR part 357 , and the provisions of 31 CFR part 306 shall no longer apply.(c) Securities held under subpart O of this part may not be transferred to Legacy Treasury Direct.