18b Caterpillar Bulldozer, issued 1958, length 50mm, box type B.
18c Caterpillar Bulldozer, issued 1961, length 58mm, box types B-C and D.
18d Caterpillar D8 Bulldozer, issued 1964, length 62mm, box type E.
18e Field Car, issued 1969, length 67mm, box type F.
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/18aonbox320x268_zpsed5c32a0.jpg)
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/1-18avariationpage1654x350_zps5fc34b98.jpg)
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/18b383x320_zps35e6606b.jpg)
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/1-18bvariationpage2225x400_zps8fd9abee.jpg)
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/1-18cx21245x368_zps1207a1d8.jpg)
The 18c models notice the difference between the drivers, and the two exhausts.
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/1-18cvariationpage1725x952_zps13afc4c0.jpg)
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/1-019_zpsa0cb06c6.jpg)
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/1-18dBexaustampLexaust1263x362_zps84bc5798.jpg)
The tall and short exhausts, also two colours of Yellow.
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/1-18eonbox845x808320x306_zps37ffcbf6.jpg)
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/18e_zps924dac55.jpg)
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/18ebases_zps4a01cc4e.jpg)
The two different bases.
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/1-18eonboxGreenWh835x808_zps4d254f2c.jpg)
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/18eGPWb_zps2c476428.jpg)
![Image](http://i286.photobucket.com/albums/ll101/kerbside2008/Quiries/Genesis/1-18evariationpage2193x465_zps1bf4fded.jpg)
George T.