diff --git a/validate/basicModels/r29.txt b/validate/basicModels/r29.txt
new file mode 100644
index 00000000..1cfa5b63
--- /dev/null
+++ b/validate/basicModels/r29.txt
@@ -0,0 +1,2 @@
+NFSIM ONLY: population testing, with reaction log
+-sim 100 -oSteps 100 -rxnlog basicModels/v29_rxns.json
\ No newline at end of file
diff --git a/validate/basicModels/r30.txt b/validate/basicModels/r30.txt
new file mode 100644
index 00000000..e18c552a
--- /dev/null
+++ b/validate/basicModels/r30.txt
@@ -0,0 +1,2 @@
+NFSIM ONLY: population testing, with reaction log
+-sim 100 -oSteps 100 -rxnlog basicModels/v30_rxns.json
\ No newline at end of file
diff --git a/validate/basicModels/v29.bngl b/validate/basicModels/v29.bngl
new file mode 100644
index 00000000..be07a2a9
--- /dev/null
+++ b/validate/basicModels/v29.bngl
@@ -0,0 +1,16 @@
+# issue37_test.bngl
+
+begin model
+begin species
+  A() 0
+end species
+begin observables
+  Molecules A A()
+end observables
+begin reaction rules
+  0 <-> A() 10,1
+end reaction rules
+end model
+
+## model actions ##
+writeXML()
\ No newline at end of file
diff --git a/validate/basicModels/v30.bngl b/validate/basicModels/v30.bngl
new file mode 100644
index 00000000..dcfdadf2
--- /dev/null
+++ b/validate/basicModels/v30.bngl
@@ -0,0 +1,17 @@
+# issue37_test2.bngl
+
+begin model
+begin species
+  A() 100
+  B() 0
+end species
+begin observables
+  Molecules A A()
+end observables
+begin reaction rules
+  0 <-> A() 10,1
+end reaction rules
+end model
+
+## model actions ##
+writeXML()
\ No newline at end of file