McCaul was an extraordinary note-taker and filer of documents, and left a remarkably complete archive of the documents generated through her many projects. This includes reports, draft reports, presentations, meeting minutes, and correspondence. In many instances the documents are accompanied by her thorough personal notes. Altogether, this provides an unparalleled insight into the planning and implementation of Rea Vaya, and the many smaller projects she worked on including early bus reform projects for the City of Johannesburg and the Gauteng Provincial Government, reforms to national transport legislation, development of national BRT policy, other planned BRTs including those in Tshwane, Nelson Mandela Bay, and Ekurhuleni, and almost every pre-Rea Vaya transport policy of the City of Johannesburg. There is no more than a handful of people who were involved in so many aspects of Johannesburg’s post-apartheid transport system, and likely none who documented their work as thoroughly. This collection will be invaluable to scholars of Johannesburg, local government, bureaucracy, BRT, and urban transport policy.

The articles relate to the chemical analysis of clay tobacco pipes, including that of William Shakespeare, which indicate the smoking of Cannabis in Shakespeare's time.