Custom-designed tabulations may be developed 
when data are not published elsewhere. These 
tabulations are developed to individual user 
speeifieations on a eost-reimbursable basis and 
shared with the publie. Quiek Stats, NASS’s online 
database that allows data users to build eustomized 
queries, should be investigated before requesting a 
eustom tabulation. 
All speeial studies and eustom tabulations are subjeet 
to a thorough diselosure review prior to release to 
prevent the diselosure of any individual respondent 
data. Requests for eustom tabulations ean be 
submitted via the internet from the NASS home 
page, by mail, or by e-mail to: 
Data Lab 
National Agrieultural Statisties Serviee 
Room 6436A, Stop 2054 
1400 Independenee Avenue, S.W. 
Washington, D.C. 20250-2054 
or 
Datalab@nass.usda.gov 
ABBREVIATIONS AND SYMBOLS 
The following abbreviations and symbols are used 
throughout the tables: 
( - ) Represents zero. 
(D) Withheld to avoid diselosing data for 
individual farms. 
(H) Coeffieient of variation is greater than 
or equal to 99.95 pereent or the standard 
error is greater than or equal to 99.95 
pereent of mean. 
(L) Coeffieient of variation is less than 
0.05 pereent or the standard error 
is less than 0.05 pereent of the mean. 
(NA) Not available. 
(X) Not applieable. 
(Z) Less than half the unit shown. 
2012 Census of Agriculture INTRODUCTION VII 
USDA, National Agricultural Statistics Service 
