There is no minimum order requirement. For faster service, please provide us with the following information:

• Customer account number (if you have one)
  
• Name of principal investigator
  
• Valid purchase order number
  
• Name and phone number of end user
• Billing address
  
• Shipping address
  
• Name and phone number of purchasing agent
  
• Catalog number and description of product
  
• Quantity

To confirm your telephone order in writing, mark your confirmation clearly with "Confirmation — Do Not Duplicate" and send or fax it to us at the toll-free number. If your institution orders regularly, written confirmation of telephone orders is generally unnecessary.