Pure Land Schools' version of the Three (or Four) Marks of Existence I'd be grateful for references to some of the major Pure Land schools' versions of the Three (or Four) Marks (Seals) of Existence:


Impermanence (anicca)
Suffering (dukkha)
No-self (anattā) 
Liberation (nirvāṇa)


Addendum -- pointers to the individual topics in any Pure Land tradition would be fine -- does not have to be all together.

Jan 6 -- beyond my own answer, with three references, I would still be grateful for further items, plus explanations of where the three marks (that is, the somewhat philosophical ideas so crucial to Theravada and Tibetan schools) fit into Pure Land in general, and on the specific texts I found.
Here is something on Shin, with a bit of discussion on the individual topics -- http://www.nembutsu.info/primshin.htm -- plus this at the very end (emphasis added):


  Conclusion
  
  We urge readers to examine the following essentials because, when
  viewed in isolation from them, a skewed view of Shin Buddhism will
  result: the Four Noble Truths; the Three Signata, namely, anatman or
  'non-self', anitya or 'impermanence' and dukkha or 'suffering'; and,
  finally, Nirvana, which - as we have seen earlier - in Shin Buddhism
  is synonymous with Amida Buddha and the Pure Land. These are the
  teachings upon which Buddhism is grounded.




Also, from the book:
Pure Land Buddhism
Dialogs with Ancient Masters
by Patriach Chih I and Master T'ien Ju
translated by Master Thich Thien Tam
at http://www.buddhanet.net/pdf_file/pureland.pdf


  Merely achieving rebirth in the Pure Land is attaining the stage  of
  non-retrogression. As stated in the sutras:
  
  “Those who achieve rebirth all dwell in correct samadhi.” 
  
  It is also stated in the Amitabha Sutra:
  
  “Sentient beings who are reborn in the Western Pure Land are  all at
  the stage of non-retrogession.”
  
  The Treatise on the Ten Doubts [Question 6] states that there are five
  reasons why those who are  reborn achieve non-retrogression:
  
  ...
  
  c) In the Western Pure Land, the birds, water, forests, trees, wind 
  and music all preach the Dharma of ‘suffering, emptiness, 
  impermanence and no-self.’ Upon hearing this, practitioners  begin to
  focus on the Buddha, the Dharma and the Sangha;
  
  ...


Does anyone know the significance of The Treatise on the Ten Doubts in Pure Land? I cannot find much online.



In -- The Sutra of Visualization of the Buddha of Infinite Life -- at http://www.fodian.net/world/365_sutra_1.htm III, VI, XVI -- here it is in III:


  Pure breezes of the eight pleasing qualities are produced by these
  rays of light, causing the musical instruments to play in voices which
  proclaim the truths of ‘suffering, emptiness, impermanence and
  non-self.’


Interesting that in these last two, emptiness is added to make 4 marks.