Thanks are due to many people for help and encouragement on this site. Of these I must single out the late Tim Nicholson who had a wealth of knowledge about commercial cartography, and was always willing to share it. He also managed to source many of the less common maps in my collection, and will be much missed by all UK sheet map collectors. An appreciation of his Tim's life (PDF file) is included on the website of the Charles Close Society.
Historical Sources
I have attempted to give a brief summary of the development in Europe for most of the brands on this site. Some people have asked me what my principal sources have been; the answer has to be "varied". The key sources for the more recent information are:
the Financial Times
Petroleum Review
Erdölinformationsdienst
but these are augmented occasionally by other newspapers, including The Times, and periodicals such as Fuel Oil News and NPN International.
Company Reports and Accounts are sometimes helpful, as are - increasingly - their own websites. Where there are officially sanctioned company histories, these can be most helpful, although most seem to dwell on the upstream side. Nonetheless, the following have proved useful:
AGIP
Mattei Oil & Power Politics, Faber & Faber, London 1966
AZUR
Un Siècle d'Industrie Française du Pétrole, Desmarais Frères, Paris, 1961
BP
BP Fifty Years in Pictures, BP, London, 1959
Adventure in Oil, Sidgwick & Jackson, London, 1959
Geschichte der Deutschen BP, 1904-1979, Hamburg, 1979
Portrait in Oil, James X James, London, 1995
British Petroleum and Global Oil, 1950-1975: The Challenge of Nationalism, Cambridge University Press, 2000
BP 100 The first hundred years in pictures, 2009
BURMAH
A History of the Burmah Oil Company, Volume II, Heinemann, London 1988
CONOCO (Jet)
Conoco The First 100 Years, Dell, New York, 1975
DEA
100 Jahre RWE-DEA, RWE-DEA, Hamburg, 1999
DUCKHAM'S
The Duckham's Story - A Century of Fighting Friction, Haynes Publishing, Sparkford, 1999
FINA
Petrofina - un Groupe Pétrolier International et la Gestion de L'Incertitude, Ed. Peeters, Louvain, 1997
MOBIL (GB)
Mobil into the second century, Mobil, London, 1985
OK/IC
Olja i Samköp, Rabén & Sjögren, Stockholm, 1967
Detta är OK, OK, Stockholm?, 1984
SHELL
Bearsted: A biography of Marcus Samuel, Kelley, New York, 1970
The Royal Dutch Petroleum Company 1890-1950, Nijgh & van Ditmar, The Hague, 1950
A Century in Oil, Weidenfeld & Nicholson, London, 1997
STANDARD OIL (and successors)
Titan - the Life of John D. Rockefeller, Little Brown & Co, New York, 1998
Standard Oil the first 125 years, Motorbooks International, Osceola, 1996
TEXACO/CALTEX
The Texaco Story the first 50 years, Texaco, New York, 1953
TOTAL
La Compagnie Française de Pétroles du franc-or au pétrole-franc, Plon, Paris, 1962
1924/99 The Story of Total, Energies (magazine), Paris, 1999
Among other books describing the wider oil industry, I should single out Anthony Sampson's "The Seven Sisters" (Hodder and Stoughton, London, 1975) and, although somewhat long in the tooth now, Christopher Tugendhat's "Oil - the Biggest Business" (Eyre & Spottiswoode, London, 1968), both of which helped to kindle my interest in the subject. Of those books looking at petrol stations as more of a sociological phenomenon (or from a nostalgic viewpoint) three European titles stand out: from Germany, Berndt Polster's Super oder Normal and from Sweden, Olle Wilson's Full Tank! and Staffan Bengtsson & Göran Willis's K-Märkt på väg. There are of course many more such books about US Gas Stations and many of these are listed in Guy Kudlemyer's bibliography which is also maintained on this site.
Yellow pages have proved an invaluable resource, although not always reliable in terms of identifying actual branding! Among other directories, Who Owns Whom? was consistently useful for over 25 years, and the FT Oil & Gas Directory (formerly Skinner's) has been helpful. Jane's Major Companies of Europe was valuable when I first started gathering information.
Lisbon (Lisboa) 1965 Shell Portugal 1:700,000 Litografia de Portugal
Lidköping 1962 Shell South Sweden 1:1,000,000 Kartografiska Institutet
Duncasby Head 1969 Shell Northern Scotland 1:316,800 George Philip & Son