I agree with GeoffHa & BlackJag Adminware is great for Machin referencing etc and I use the Adminware pages for 2 of my albums. One of the very best Machin references is the DEEGAM HANDBOOK, invented by Douglas Mayall and is now continued by Gerry Fisk after Douglas sadly died earlier this year. The handbook can be purchased on disc and Gerry posts the disc and updates worldwide. I would recommend this system to anyone who collects machins. It is a full reference to EVERY machin TYPE with regular free reports on updates. More extensive than any other system I have seen and user friendly for beginners, intermediates and specialist collectors alike. I have no financial gain from this post just trying to help other machin collectors. The link to the Deegam site is
http://www.deegam.com/