关于推荐信的问题

申请快进入尾声了，不过推荐信的问题很多学校说的都不清楚。现在几乎所有学校都接受在线推荐，不过也接受纸质推荐信。但都没有明确的说只要在线推荐了就不用寄送纸质推荐信啊。
比如Purdue的Chemical Engineering:

Supporting Documents:  Additional documents are required to support the application.  Supporting documents should be mailed directly to the graduate program to which you are applying.  Supporting documents include the following, unless specific instructions are noted in the "Completing the Application" section of this page:        

•         Transcripts
•         GRE Test
•         English Proficiency
•         Recommendation letters
•   Statement of Purpose
• Diversity/Fellowship Essay

我已经完成推荐人的在线推荐了，那还需要寄送纸质推荐信吗？按照这个Supporting Documents的说法像是要寄送的。而点进这个Recommendation letters的链接后出现的是：

When you create an online application to the Purdue Graduate School, you will have the opportunity to enter the names of your recommendation providers along with the preferred method of submission for the recommendation. If you elect to have the recommendation submitted online, your recommendation provider will receive an automatic email notification with instructions for accessing our online recommendation system. Once the online recommendation is submitted the graduate program to which you applied will have access to view your online recommendation.                                                                                  For recommenders wishing to complete a paper recommendation, please send the following recommendation form.

这段的意思又像是Online和paper只要二选一啊，不写明确真蛋疼。

又如Lehigh的Chemical Engineering:
Listed below are the degree programs offered through the P.C. Rossin College of Engineering and Applied Science at Lehigh University. To ensure that your application is handled expeditiously, please collect and return your application, transcripts, and letters of recommendation TO YOUR PROPOSED PROGRAM listed below in a large envelope. ALL APPLICATIONS FOR FALL ADMISSION WITH FINANCIAL AID REQUIREMENTS MUST BE SUBMITTED BY JANUARY 15th. For Spring deadlines please check with the department or program.

同样我也完成了Lehigh的Online推荐，但这段看上去就是要寄送的意思啊，求大神帮忙～

lz 好快啊，已经接近尾声了

就是，我感觉很多学校的都没开始呢，楼主已经进入尾声了吗？这就是差距。。。

很多学校PHD12月1号前要Fellowship就得申请啊，Rolling的更得提早。。有没有大神可以解答一下我的疑问啊~