If you want data more recent than a 1930's memo...
You can judge for yourself if the following sources are more credible than documents cherrypicked by lawyers engaged in a lawsuit against Eli Lily....and regurgitated on Rense.com...
The risk of autism and other autistic-spectrum disorders did not differ significantly between children vaccinated with thimerosal-containing vaccine and children vaccinated with thimerosal-free vaccine (RR, 0.85 [95% confidence interval {CI}, 0.60-1.20] for autism; RR, 1.12 [95% CI, 0.88-1.43] for other autistic-spectrum disorders). Furthermore, we found no evidence of a dose-response association (increase in RR per 25 µg of ethylmercury, 0.98 [95% CI, 0.90-1.06] for autism and 1.03 [95% CI, 0.98-1.09] for other autistic-spectrum disorders).
Conclusion The results do not support a causal relationship between childhood vaccination with thimerosal-containing vaccines and development of autistic-spectrum disorders.
Author Affiliations: Danish Epidemiology Science Centre, Department of Epidemiology Research (Messrs Hviid, Wohlfahrt, and Dr Melbye) and Medical Department (Dr Stellfeld), Statens Serum Institut, Copenhagen, Denmark.
From: Journal of the American Medical Association http://jama.ama-assn.org/cgi/content/abstract/290/13/1763
Beyond the headlines: Link still claimed between thimerosal and autism
Activists stand by their argument despite the fact that science has yet to find proof of the link.
From AMEDNEWS.COM http://www.ama-assn.org/amednews/2006/06/19/hlsa0619.htm
On May 18th, 2004, the Institute of Medicine (IOM) released its eighth and final report from its Immunization Safety Review Committee. Based on a thorough review of clinical and epidemiological studies, neither the mercury-based vaccine preservative thimerosal nor the measles-mumps-rubella (MMR) vaccine are associated with autism, says the new report. Furthermore, the hypotheses regarding how the MMR vaccine and thimerosal could trigger autism lack supporting evidence and are theoretical only. Further research to find the cause of autism should be directed toward other lines of inquiry that are supported by current knowledge and evidence and offer more promise for providing an answer, said the committee that wrote the report.
From the AMA http://www.ama-assn.org/ama/pub/category/13703.html