To login with your portal password, click the orange button and then select University of London Online Library (Portal Login).
As the official digital dissertations archive for the Library of Congress and as the database of record for graduate research, PQDTGlobal includes millions of searchable citations to dissertations and theses from 1861 to the present day together with over a million full-text dissertations.
If there is no PDF option for a dissertation, this means that the full-text of that dissertation is not available.