Many online retailers are happy to send you a replacement manual, or diagrams. Unless somebody here has a copy to e-mail you, I would suggest contacting Melissa and Doug directly. You might have to pay for shipping, but they will probably send you a new set of diagrams no problem.
Here are the options you have for contacting Melissa and Doug customer service:
US or Canada: (800) 718-5365. This number is toll-free.
UK: 0800-731-0578.
All Other Countries: +1-203-762-4500
Service@MelissaAndDoug.comMelissa and Doug customer service hours are Monday-Thursday 7am-6pm EST, and Friday 7am-5pm EST.
Get the full contact info here:
http://www.melissaanddoug.com/contact.phtml Good luck!